GL1000 GSXR Swap information

Tifun

Indy
Hi. Recently we finished up swapping a GSXR inverted front on to a 75 GL1000 and felt I needed to share this with the community. There was a lot of trial and error before we got it all sorted.

The donor bike was an 06 GSXR 600. The forks were completely rebuilt and heavier weight springs were out in to match the bikes weight along with the rider.

We initially wanted to stay with the wheels that came with the bike (Lesters) which were worlds lighter than the stock spoke wheels. Upon the initial attempt to fit the wheel we discovered the rotors sat too far out and actually didn't fit between the forks. We didn't spend much time trying to sort this issue. Maybe later down the road we will dabble with it again. Instead we went with the Suzuki wheel.

Ok, on to the content regarding the forks. The only real modification was completed to the lower triple tree. Essentially the stem is short by about a half inch. Creativity took place and I devised a solution to resolve it.

Tools used:
Manual mill
Lathe
Press

First I pressed out the stem from the tree. Be gingerly with this or you can snap the lower tree mount.

Next I threw the lower tree on the lathe and machined out the lower ID stop flange. Roughly 3mm. This will allow the stem to actually press in further. The lower stem flange sits just outside the tree in stock form. Now the flange sits flush to the bottom of the tree.

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After that simply throw the lower tree on the mill and deck roughly another 3mm off the top as shown in the photo.

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Next it's time to press the stem back in. Use caution when pressing it back in. You don't want that dude going in crooked.

Once that is finished bolt it all up and rule the world. We used the recommended Allballs bearing kit for those curious. These modifications allow the stem to come out enough to allow the upper tree to bolt on.

There's still work needed before we get the bike out on the road but it's making progress and really looks awesome. Hopefully it performs equally as good. Let me know if there are any questions. I'll answer what I can.



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canyoncarver

'hacking is learning'
DTT BOTM WINNER
Man, so many of these old GL's getting the treatment. Makes me kinda want one. Nice mod.
 

Tifun

Indy
It's got modern style power. It's a great platform. Just heavy as hell.


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irk miller

You've been mostly-dead all day.
DTT BOTM WINNER
Have you run this with these forks? I had a GSXR front end on mine and felt is was way too low, and not really made for the weight.
 

focusinprogress

City Limit Moto:Parts-Service-Apparel (716)8038606
deviant said:
Have you run this with these forks? I had a GSXR front end on mine and felt is was way too low, and not really made for the weight.

it's definitely very low.

getting the lester to work wouldn't be all that bad....just switch the rotors out....are they 6-bolt or 5-bolt rotors on the lesters? whats the diameter of the GSXR rotors on there now?

some rotors off another bike might be the right bolt pattern for the lesters yet be the right diameter for the GSXR calipers....may just need some spacers made up.
 

Tune-A-Fish

BOTM LOSER Proudly Deplorable
canyoncarver said:
Man, so many of these old GL's getting the treatment. Makes me kinda want one. Nice mod.

GL Madness!! Lookin Shweet Mang!

It's peakin my interest also. I need a heavy weight for a keeper rider and as but ass ugly as the GL in stock form is... Erick's is causing my brain to crater.

I see the lowering as a possible issue (I like beer) so I may find a way to actually have a stem and gull wing top clamp so the bike can ride at stock Geo... I also like the ZX setup in all black with black coated stanchions. 8) 8) two cool.
 

Tifun

Indy
deviant said:
Have you run this with these forks? I had a GSXR front end on mine and felt is was way too low, and not really made for the weight.

Proper spring weight corrected that issue. After measuring everything it's only 1.5" lower than stock. Which is completely attributed to the 17" wheel.

Keep in mind in the pictures that the forks have preload due to ratcheting it down on the lift.


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Tifun

Indy
focusinprogress said:
it's definitely very low.

getting the lester to work wouldn't be all that bad....just switch the rotors out....are they 6-bolt or 5-bolt rotors on the lesters? whats the diameter of the GSXR rotors on there now?

some rotors off another bike might be the right bolt pattern for the lesters yet be the right diameter for the GSXR calipers....may just need some spacers made up.

The Lester won't fit. The hub with rotor is too wide. No amount of machining would resolve it aside from a new upper and lower tree to accommodate for the offset. The hub pushes out so far that spacers can't even be put in. Additionally the rotor placement is straight up and down with zero offset which won't allow the calipers to fit the brake rotor location. Other fronts may work for the wheels, this one won't sadly.


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Tifun

Indy
Tune-A-Fish said:
GL Madness!! Lookin Shweet Mang!

It's peakin my interest also. I need a heavy weight for a keeper rider and as but ass ugly as the GL in stock form is... Erick's is causing my brain to crater.

I see the lowering as a possible issue (I like beer) so I may find a way to actually have a stem and gull wing top clamp so the bike can ride at stock Geo... I also like the ZX setup in all black with black coated stanchions. 8) 8) two cool.

Stock geometry isn't a possibility. Even at stock ride height the trail changes due to the rake and sanction width. If anything it's only going to improve the overall performance. Especially when matches with proper internals such as springs and dampening etc...


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irk miller

You've been mostly-dead all day.
DTT BOTM WINNER
The difference between 17" and 19" is 1". You're radius determines your hight. The GSXR 750 forks are 29" (738mm) and the 1000 are 28 3/8" (720mm). Are you sure? Stock GL is 30". Mine had them on it.
 

Tifun

Indy
deviant said:
The difference between 17" and 19" is 1". You're radius determines your hight. The GSXR 750 forks are 29" (738mm) and the 1000 are 28 3/8" (720mm). Are you sure? Stock GL is 30". Mine had them on it.

From what I can tell on the bike sitting stationary, yes. I'm assuming the tire height also plays a factor to my measurements.


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Tune-A-Fish

BOTM LOSER Proudly Deplorable
Tifun said:
Stock geometry isn't a possibility. Even at stock ride height the trail changes due to the rake and sanction width. If anything it's only going to improve the overall performance. Especially when matches with proper internals such as springs and dampening etc...


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Yep.

Width axis is likely the least of my concern and can be (new word warning) "closened" some with custom clamps which also can be made to rein in the rake, finish that all off with a shock length, swingarm and wheel tire package to get it in the sweet spot for a slightly larger than normal dude and... wha la. me going down the road looking at other guys wives tits in the car next to me :eek:

I do like this ride the way it is though, just not likely to work for Moi.
 

xb33bsa

Over 1,000 Posts
there are so many better choices for forks, if anything a wing needs to be lifted not dropped,besides the triople clamp offset is wrong on any inverted forks , you would need custom clamps to do it right, but still why improve the suspension if you cant use it ?
 

Tune-A-Fish

BOTM LOSER Proudly Deplorable
xb33bsa said:
why improve the suspension if you cant use it ?

Cause the future is so bright I gotta wear shades 8) Cool is Cool and Bad is Bad mang.

When yer old(r) and can't see real good those big brakes help some :eek:
 

xb33bsa

Over 1,000 Posts
Tune-A-Fish said:
Cause the future is so bright I gotta wear shades 8) Cool is Cool and Bad is Bad mang.

When yer old(r) and can't see real good those big brakes help some :eek:
brakes are for slowing down for the turns,so i see the logic now, yes you need better brakes when you put gixxer forks onnit cause you gotta take the turn sloer
butteye digress,upgrading brakes is no excuse for ruining handling and cornering clarence
 

Tifun

Indy
Bike is off the lift and put on the road. Huge difference. Front is no longer spongy, brakes are amazing, and it no longer has the death wobble. Front tire needs replaced. https://vimeo.com/149596535
c1b762b5b0ed3dc3d2501ac0310c80be.jpg



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P

Pilgrim9283

Guest
Diggin it. What risers did you use to mount the bars?


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